Chi (χ)-alumina dispersion and application to coating slurry of digital printing medium

a technology of alumina dispersion and digital printing medium, applied in the field of coating slurry, can solve the problems of poor ink absorption of coating layer, increased cost, and powder coming off and even peeling off of coating layer, and achieves high ink absorption and low cost. , the effect of high specific surface area

Inactive Publication Date: 2012-03-20
NAT CHENG KUNG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0008]Accordingly, it is an aspect of the present invention to provide a χ-alumina dispersion, which is utilized to make a coating slurry, so as to produce a printing medium for digital printing. Gibbsite is subjected to thermal treating, physical wet-milling and / or mixing and pH adjusting processes, so as to obtain the χ-alumina dispersion containing flaked porous χ-alumina nanoparticles. Since the χ-alumina nanoparticles have high ink absorption and low cost, the coating layer formed by the χ-alumina dispersion has high water resistance and high ink absorptivity, they can be applied to the coating layer of the digital printing medium.
[0013]With application to the aforementioned χ-alumina dispersion and coating slurry of digital printing medium containing the same, which include flaked porous χ-alumina nanoparticles with high specific surface area. Since the χ-alumina nanoparticles have high ink absorptivity and low cost, they can be applied to the coating layer of the digital printing medium.

Problems solved by technology

However, the coating slurry added with too more adhesive is too viscous to spread, and the resulted coating layer has poor ink absorptivity.
On the contrary, the coating slurry added with too less adhesive is too thin to fix the coating layer and the printing substrate, and the resulted coating layer suffers powder coming off and even peeling off.
Domestic industries acquire the material of the aforementioned coating layer only through import, and the cost is more expensive.
Even though other powder substitutes silica, the resulted composite material hardly matches the requirements of quick printing, water resistance, and glossy surface.
In the example of the most available silica-based coating layer applied on the paper, this coating layer hardly matches the requirement of glossy surface.
Moreover, the silica is applied in the coating layer, the printout easily diffuses while suffering water, and the silica-based coating layer has poor water resistance.
Furthermore, the silica-based coating slurry has less solid content, for example, 15% to 20%, and it consumes more time for coating and drying.

Method used

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  • Chi (χ)-alumina dispersion and application to coating slurry of digital printing medium
  • Chi (χ)-alumina dispersion and application to coating slurry of digital printing medium
  • Chi (χ)-alumina dispersion and application to coating slurry of digital printing medium

Examples

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Effect test

example 1

Preparation of χ-Alumina Nanoparticles and Dispersion Thereof

[0038]EXAMPLE 1 is related to prepare χ-alumina nanoparticles and dispersion thereof. Firstly, gibbsite powder (Model No. M010, Beaming Co. Ltd., Taiwan) is heated in a covered alumina crucible in a heating rate of 5° C. / min to 15° C. / min until a temperature of 400° C. to 1000° C., keeping it at the temperature for 30 minutes to 100 minutes, so as to transform to χ-alumina. Or, the gibbsite powder is heated in the covered alumina crucible in a heating rate of 8° C. / min to 12° C. / min until a temperature of 500° C. to 700° C., keeping it at the temperature for 50 minutes to 90 minutes, so as to transform to χ-alumina. Alternatively, the gibbsite powder is heated in the covered alumina crucible in a heating rate of about 10° C. / min until a temperature of 600° C., keeping it at the temperature for 70 minutes to 90 minutes, so as to transform to χ-alumina.

[0039]Next, the resulted χ-alumina may be subjected to a physical wet-mil...

example 2

Preparation or Coating Slurry of Digital Printing

[0046]EXAMPLE 2 is related to prepare a coating slurry of digital printing, so as to form composite printing medium. In this EXAMPLE, the χ-alumina dispersion obtained in EXAMPLE 1 is stilly placed (aging process) for a period of time, thereby the pH value of the χ-alumina dispersion obtained in EXAMPLE 1 may reach 4 to 5. Subsequently, a pH adjusting process is performed, in which the pH of the aged χ-alumina dispersion is adjusted by using an inorganic or organic acidic solution that has the same pH value as the aged χ-alumina dispersion. The suitable inorganic or organic acidic solution utilized in pH adjusting process may be an inorganic acidic solution such as nitric acid, sulfuric acid, phosphoric acid, or hydrochloric acid, or an organic acidic solution such as formic acid, acetic acid, propionic acid, oxalic acid or malonic acid. The resulted χ-alumina dispersion has a solid content of 20 wt. % to 40 wt. %.

[0047]Later, the age...

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Abstract

A chi (χ)-alumina dispersion and coating slurry of digital printing medium containing the same is disclosed, which includes flaked porous χ-alumina nanoparticles with high specific surface area obtained by subjecting gibbsite to thermal treating, physical wet-milling and pH adjusting processes. Since the χ-alumina nanoparticles have high ink absorptivity and low cost, they can be applied to the coating layer of the digital printing medium instead of conventional silica material.

Description

RELATED APPLICATIONS[0001]This application claims priority to Taiwan Application Serial Number 97140542, filed Oct. 22, 2008, which is herein incorporated by reference.FIELD OF THE INVENTION[0002]This invention relates generally to a coating slurry, and more particularly, to a coating slurry of digital printing medium, which contains flaked chi (χ)-alumina nanoparticles with high specific surface area, so as to form a coating layer with high ink absorptivity, water resistance, glossy or mat surface.BACKGROUND OF THE INVENTION[0003]Depending on speedy advancement of computer technology, computerized graphics (or digital printing) is the mainstream of modern printing technology. In comparison with complicated processes of conventional printing, digital printing is the reproduction of digital images on a surface of a print substrate (ex. paper) by in-position printing the selected ink pigments injected from lasers or specific nozzles that are controlled by delicate electrical injecting...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): C01F7/02
CPCC09D7/1291C09D7/1266C09D7/1275C09D7/1216B41M5/52D21H19/385C08K3/22B41M5/5254B41M5/5218B41M5/5236Y10T428/256Y10T428/257C09D7/61C09D7/67C09D7/68C09D7/70
Inventor YEN, FU-SUWU, TZUNG-JIUNG
Owner NAT CHENG KUNG UNIV
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